Longer stills battery life

Cameras with longer battery life can take more photos before exhausting their batteries.

Special note: The measurement standard for battery life stipulates that if a camera has an internal flash, it must be used for 50% of photos taken. For this reason, comparisons of one camera with an internal flash to another without will not be comparable

560
vs
340 shots

Capture more photos

Internal flash

Internal flash
vs
None

Useful in a pinch for fill flash

Top deck display

Yes
vs
No

Check settings with a screen on top of the camera

Less shutter lag

0.14
vs
0.36 sec

Focus and take a photo quickly (wide angle)

Dual card slots

Yes
vs
No

Gives you more storage flexibility

Optional anti-aliasing filter

Optional
vs
None

Lets you choose sharper photos or reduced moiré

Faster JPEG shooting

7.1 fps
vs
4.0 fps

Faster JPEG shooting (burst mode)

Bigger JPEG buffer

75
vs
15 shots

Take more JPEG shots before waiting (burst mode)

Faster RAW shooting

7.1 fps
vs
4.0 fps

Faster RAW shooting in burst mode

Bigger RAW buffer

24
vs
15 shots

Larger buffer for RAW shots (burst mode)

Sony A7R advantages over Pentax K-3

Larger sensor

35mm
vs
APS-C

More sensor area. Bigger is (generally) better.

Bigger pixels

~ 4.88
vs
3.91 microns

Better low-light and dynamic range (all else equal)

In-camera panoramas

Yes
vs
No

Stitches multiple shots into a panoramic photo

Tiltable Screen

Tiltable
vs
Fixed

Tilt the screen for shooting flexbility

Built-in Wi-Fi

Wi-Fi
vs
None

Share your photos wirelessly

NFC

Yes
vs
No

Simplifies pairing your camera with supported phones

Higher effective ISO

Higher effective ISO

Maximum effective ISO is an estimate of the highest sensitivity at which a camera can capture excellent quality photos.

Cameras with higher effective ISO will be better choices for indoor photography, night shooting, and indoor sports photography, especially if you intend to make large prints.

AE Lock button is poorly located; Below-average battery life for a DSLR; Rather dated-looking menu system; Requires a different battery grip accessory than its predecessors; Less third-party support than some rivals

Incredibly small body for a fully-featured, full-frame camera; Resolution that rivals a medium-format camera; Excellent image quality even at very high sensitivities; Decent performance bearing in mind its extremely high resolution; Accepts existing Alpha-mount and E-mount lenses, and can optionally crop to APS-C image circle.